CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 233,752	$ 254,530
Short-term investments	22,104	20,059
Assets held for sale	86,608	75,678
Accounts receivable, net	504,099	784,671
Inventory	151,753	153,824
Other current assets	192,927	187,135
Total current assets	1,191,243	1,475,897
Property, plant and equipment, net	6,765,257	7,027,802
Goodwill	167,275	166,659
Investment in unconsolidated affiliates	888	415,177
Other long-term assets	531,642	452,305
Total assets	8,656,305	9,537,840
Current liabilities:
Current portion of debt	175	6,508
Trade accounts payable	199,619	271,984
Accrued liabilities	650,019	686,613
Income taxes payable	18,362	41,394
Total current liabilities	868,175	1,006,499
Long-term debt	3,503,172	3,655,200
Other long-term liabilities	518,035	552,947
Deferred income taxes	44,225	29,326
Total liabilities	4,933,607	5,243,972
Commitments and contingencies (Note 7)
Shareholders' equity:
Common shares, par value $0.001 per share: Authorized common shares 800,000; issued 333,054 and 330,526, respectively	333	331
Capital in excess of par value	2,505,451	2,493,100
Accumulated other comprehensive income (loss)	(8,250)	(47,593)
Retained earnings	2,514,265	3,131,134
Less: treasury shares, at cost, 49,673 and 49,342 common shares, respectively	(1,295,949)	(1,294,262)
Total shareholders' equity	3,715,850	4,282,710
Noncontrolling interest	6,848	11,158
Total equity	3,722,698	4,293,868
Total liabilities and equity	$ 8,656,305	$ 9,537,840